Abstract
The (O) (H) functionalization of carbon nano- tube (CNT) was studied using oxygen-hydrogen (O2-H2) gas mixture direct current (DC) glow discharge plasma technique for cathode/CNT-anode separation of 0.10 ± 0.01 cm. O2 and H2 were fixed at flowrate of 10.0 ml/min in order to obtain gas mixture ratio of 1:1. During the (O2-H2) gas mixture DC glow discharge, current-voltage (I-V) characteristic of gaseous species studied for various settings of gas pressures 1, 2, 3 and 4 mbar. The voltage at gap between cathode/CNT and anode, a breakdown voltage, was identified as ''functionalization voltage'' (Vfunc). Vfunc was noticed responsible for functionalization of functional groups on sidewall of CNT. The Vfunc were recorded as 796, 707, 594, and 663 V for gas pressures of 1, 2, 3 and 4 mbar, respectively. The co-relation between Vfunc and gas pressure was identified as linear relationship. But a voltage obtained due to the CNT/Cathode fall shows exponential relationship with the gas pressures. The possibility of (O) (H) functional- ization was proved using Fourier transmission infra-red (FTIR) spectroscopy. Hydroxyl (-OH), carboxyl (-COOH), and carbonyl (-C=O) functional groups were identical as identified in the FTIR spectra. The field emission scanning electron microscope images show significant changes in the morphology of CNT which proves that the DC gas discharge plasma is a possible technique for (O) (H) functionalization on the sidewall of CNT.
Highlights
The discovery of carbon nanotube (CNT) in 1991 has unpaved (Iijima 1991) numerous approaches
The CNTs are visible and randomly oriented and spread on the Si(001) exhibiting small grooves and small bumps of CNT bundles. This morphology has been slightly altered after treated with direct current (DC) gas discharge plasma of O2 and H2 at the gap of cathode/CNT and anode
The I–V characteristic of (O2–H2) gas mixture DC glow discharge at the cathode/CNT-anode separation is discussed based on the typical I–V characteristics reported for DC gas discharge plasma of Argon (Bogaerts et al 2002)
Summary
The discovery of carbon nanotube (CNT) in 1991 has unpaved (Iijima 1991) numerous approaches. The processing period of plasma treatment is shorter than any other techniques mentioned earlier It enables wide range dispersion of functional groups on the side wall of CNTs. CNT-anode electrode system for DC gas discharge plasma treatment of H2 and O2 gas mixture. Three drops of CNT solution dispersed onto the cleaned silicon chip and further dried for 24 h in desiccators filled with drying agent, silica gel This drying process could remove any moisture content from the CNT sample. Potential difference from high voltage supply was slowly increased to maximum to obtain a current–voltage (I–V) characteristic of [O] [H] plasma between the cathode/CNT and anode for gas pressures of 1, 2, 3 and 4 mbar. The plasma-treated CNTs were compared with the non-plasma-treated CNT using FESEM (Quanta 200F) and FTIR spectroscopy
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